21. A shopkeeper purchased 150 identical pieces of calculators at the rate of Rs. 250 each. He spent an amount of Rs. 2500 on transport and packing. He fixed the labelled price of each calculator at Rs. 320. However, he decided to give a discount of 5% on labelled price. What is the percentage profit earned by him ?
22. If a man estimates his loss as 20% of the selling price, then his loss percent is = ?
23. A person sold a TV for Rs. 9400 then he lost a particular amount. When he sold another TV of the same type at Rs. 10600, his gain was double the former loss. What was the cost price of each TV?
24. A person bought 50 pens for Rs. 50 each. He sold 40 of them at a loss of 5%. He wants to gain 10% on the whole. Then his gain percent on the remaining pens should be = ?
25. A person first increases the price of a commodity by 10% and then he announces a discount of 15%. The actual discount on the original price is -
26. Raman bought a camera and paid 20% less than its original price. He sold it at 40% profit on the price he had paid. The percentage of profit earned by Raman on the original price was -
27. A cloth merchant sold half of his cloth at 40% profit, half of remaining at 40% loss and the rest was sold at the cost price. In the total transaction his gain or loss will be = ?
28. A man purchased 150 pens at the rate of Rs. 12 per pen. He sold 50 pens at a gain of 10%. The percentage gain at which he must sell the remaining pens so as to gain 15% on the whole outlay is = ?
29. From 2008 to 2009, the sales of a book decreased by 80%. If the sales in 2010 were the same as in 2008, by what percent did it increase from 2009 to 2010 ?
30. A trader marked the price of a product in such a way that it is 20%
more than the cost price. If he allows 10% discount on the marked price to the customer then his gain is -
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